@double-beep (cc @Undo) Yes. If you give another feedback within 24 hours of your prior feedback, then the older feedback is replaced. If you give another feedback more than 24 hours after your prior feedback then you will leave an additional feedback. In that case, the older feedback will not be automatically removed. Either you or an admin will need to "clear" (i.e. delete) the older feedback. If you delete it, then it doesn't count against you in your % invalidated feedback.

@Wrzlprmft Yes. Unfortunately, metasmoke was blocked from using the SE API by SE a couple of times. These blocks spanned several days, due to a bug in HAProxy (IP addresses would get added by SE, but not removed).

@SmokeDetector Undisclosed affiliation (affiliation is mentioned in their profile). This is just a link to an associated blog post that doesn't address the question, but happens to be about a similar task.

An unfortunate reality of scale is that you have to be very mindful about the things you link to, use, and point your community to.
There are SO MANY very, very cool hobby projects out there that would be awesome to point at or integrate.
But it would kill them.

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@Shree I was actually just writing a note to let you know that it wasn't added and that you'd need to do the !!/watch again, if you wanted it. From time to time, SD misses things in chat. This one might have been complicated by you not having the !!/watch in the first version of the message.